The recommended engine oil is a 5W30 or 5W40 as alternate. Personally I've been using Total 5W30 for a long time and happy with it. But that depends upon the engine condition, climate, etc. Here in Karachi its warm all year round and yet I havent had any issue with 5W30. I am not too familiar with plugs, but I guess I am running NGK laser iridiums in my 1.6 Dewan Lancer. Not sure about the transmission oil though - my previous Lancer was a 1.3 auto which is not a CVT and the recommended transmission oil for that was Dia Queen SPIII. Dont know about CVT Lancer.